Polishing machine



1960 A. J. ANDERSON ET AL 2,948,005

POLISHING MACHINE Filed April '7, 1958 IN VEN TOR.

ALD\NE 3'- ANDERSON BYLERQY 3'- SQHOEPHOERSTER United States PatentPOLISHING MACHINE Aldine J. Anderson, 889 Russell St., St. Paul, andLeroy J. Sehoephoerster, 1012 Essex St., Minneapolis, Minn.

Filed Apr. 7, 1958, Ser. No. 726,880

3 Claims. (Cl. 15-98) This invention relates to a portable polishingmachine of the rotary type wherein an electric motor housed within acasing, drives a shaft to whose end a polishing disk or the like maybesecured and wherein handle means is demountably fastened to the casingfor use in manipulating the machine in moving the polishing element overthe work.

Heretofore, the prior portable polishing machines employed handle meanswhich were either permanently secured to the casings of the machines, orthe handle means could not be as readily mounted on the casings ofmachines or demounted from the casings of the machines.

My handle means comprises a clamp which is easily clamped on the casingand to which the hail of a handle is pivotally connected. The clampmeans is provided with an adjustable means whereby the clamp can besecurely fastened to different size casings, for polishing machines.

It is an object of this invention, to provide in a polishing machine, ahandle means which is quickly and easily mounted and demounted on thecasing of the polishing machine.

It is another object of this invention to provide in a rotary polishingmachine, handle means which can be readily mounted on diiferent sizesand styles of casings for rotary polishing machines.

It is a still further object of this invention to provide a rotarypolishing machine with handle means which are simple in construction andcheap to manufacture.

Other objects and advantages will become apparent from the detaileddescription and annexed claims.

Figure 1 is a front elevational view of the polishing machine.

Figure 2 is a perspective view of the clamp of the handle employed withthe polishing machine of Figure 1.

Figure 3 is side elevational view of the clamp shown in Figure 2.

Referring to the drawing in detail, 40 is a conventional electric drillmeans which has been converted into a polishing machine. The polishingmachine 40 comprises a lower cup-like shaped casing 42 and designed toconstitute a support for an electric motor (not shown) and provides abearing for the normally vertical shaft or spindle 44, which is adaptedto carry a polishing element (not-shown). A rearwardly extending casingportion 46 provides an outlet for the electric wiring from the electricmotor.

The demountable handle means 50 consists of an adjustable clamp whichcomprises an inverted U-shaped member 52 provided with an upstanding arm54 at the end of each leg of the inverted U-shaped member 52. The upperend of the arms 54 are provided with screw threaded apertures foraccommodating a screw threaded stud bolt 56. The bolts 56 may beunthreaded. The ends 2,948,005. Patented Aug. 9, 1960 of a coiled spring58 are connected between the upper ends of the arms 54 by the stud bolts56.

An inverted U-shaped bail 60 is pivotally mounted by rivets 62 to thelower part of the legs of the inverted U-shaped portion 52 of handlemeans 50. An elongated handle 64 is fastened on a shank 66 of the bail60.

The stud bolts 56 fit into screw threaded apertures in the oppositesides of the casing 42 for securing the arms 54 of the clamp to thecasing 42. The coiled spring 53 fits or abuts around the top of thecasing 42. If the size of the casing 42 varies, then the coiled spring58 expands to provide a snug fit for the larger sized casings.

The clamp of the handle means may be rubber coated for aiding inelimination of vibration in the polishing machine.

Variation in size of the elements and the use of different materials maybe resorted to but all such changesare deemed to fall within the scopeof the appended claims.

We claim:

1. In combination with a portable polishing machine: wherein a casinghouses an electric motor which drives a short shaft to whose lower end adisk may be attached, the center of gravity of the motor and. easingbeing close to the plane of rotation of the disk so that the disksupports the motor and casing in a stable equilibrium, an invertedU-shaped clamp member, upwardly extending. arms formed on the legs ofthe inverted u-shaped clamp: member, the upwardly extending armsdetachably secured to the sides of the casing, a spring means connectedbe-- tween the upper ends of the upwardly extending arms and fitting aportion of the casing, a bail pivotally mounted on the legs of theclamp, and a handle formed on the bail.

2. In combination with a portable polishing machine wherein a casinghouses an electric motor which drives a short shaft to whose lower end adisk may be attached, the center of gravity of the motor and easingbeing close to the plane of rotation of the disk so that the disk supports the motor and casing in a stable equilibrium, an inverted U-shapedclamp member, upwardly extending arms formed on the legs of the invertedU-shaped clamp mmeber, a resilient means connected between the upperends of the upwardly extending arms and fitting a portion of the casing,a bail pivotally mounted on the legs of the clamp, and a handle formedon the bail.

3. In combination with a portable polishing machine wherein a casinghouses an electric motor which drives a short shaft to whose lower end adisk may be attached, the center of gravity of the motor and casingbeing close to the plane of rotation of the disk so that the disksupports the motor and casing in a stable equilibrium, an invertedU-shaped clamp member, upwardly extending arms formed on the legs of theinverted U-shaped clamp member, the upwardly extending arms detachablysecured to the sides of the casing, resilient means connected betweenthe upper ends of the upwardly extending arms and fitting a portion ofthe casing, a bail pivotally mounted on the legs of the clamp, a handleformed on the bail.

References Cited in the file of this patent UNITED STATES PATENTS1,728,021 Tuteur Sept. 10, 1929 2,230,077 Foss Jan. 28, 1941 2,702,395Zaiger .Feb. 22, 1955 FOREIGN PATENTS 268,221 Great Britain Mar. 31,1927

